Sewing machine for fur and the like



Jan. 11, 1938. T. c. MLADINICH SEWING MACHINE FOR FUR AND THE LIKE Filed April 16, 1 937 4 Sheets-Sheet l BY Tbamas d/fl a i ibb ATTORNEY.

Jan. 11, 1938. T. c. MLADINICH- SEWING MACHINE FOR FUR AND THE LIKE Filed April 16, 1937 4 Sheets-Sheet 2 m fl! ATTORNEY.

Jan. 11, 1938. "r. c. MLADINICH 2,104,807

SEWING MACHINE FOR FUR AND THE LIKE Filed April 16, 1937 4 Sheets-Sheet 3 r IVEN'IZOR;

5' haw 4 Sheets-Sheet 4 T. C. MLADINICH Filed April 16, 1937 5 &

INVENT 01%,

ATTORNEY.

SEWING MACHINE FOR FUR AND THE LIKE Jan. 11, 1938.

Patented Jan. 11, 1938 UNITED STATES j PATENT OFFICE 14 Claims.

.The purpose of this invention is to provide improvements in machines for sewing fur and similar products, in which the wearing parts are improved to compensate for the increased speed at which these machines now operate, and also in which means is provided for constantly oiling all of the wearing parts.

The invention is a sewing machine of the type used for sewing fur and similar products, in which the respective parts and movements are operated through a main driving shaft, and the various movements are obtained by eccentrics, cams, and sliding blocks. These machines were normally designed to operate at a relatively low speed, however, at present it is required to operate them at about twice the original speed, so that the wear is increased, and the parts, as originally designed, do not stand up under this hard service. It has, therefore, been found necessary to make certain changes in the parts in order to reduce the wear to a minimum, and also so that the parts '"will stand up under the increased speed. I

This machine is improved by mounting the main shaft in ball bearings, installing the main operating cam in a sliding block so that the cam surface is incontinuous engagement at all times, by increasing the size of the mounting parts of the needle bar, slidably holding the guide portion of the looper frame on a block, instead of the usual pin, increasing the "length of the bearing of the looper rocker bracket, placing the feed disc pressure spring in a position aligned with the feed disc arm, improving the clutch and brake,

and incorporating a lubricating system in the frame which automatically pumps -oil to the upper part thereof from where it flows downward upon the moving parts. 40 The looper frame has heretofore been moved backward and forward by an eccentric engaging flat surfaces of a yoke thereof, and as this pro-. vides a two-point contact only, it has been found necessary to place a sliding block on the eccen tric, thereby providing a continuous wearing surface between the eccentric and block, and also providing a snug sliding movement between the block and looper frame. The looper bar and the oscillating arm in which it is held'are relawearing surfaces, and as this is subjected to an extreme thrust load it has been found necessary to increase the wearing surface between the parts thereof. The fork at the rear of the looper frame normally slides over a pin, providing a small wearing surface and, therefore, it has been found necessary to place a block on the pin,

thereby materially increasing the wearing surfaces. The feed disc arm is resiliently held in- 0 ward by a spring, andthis is connected tothe tively small and present comparatively small (Cl. 112-l6) quired to operate the feed disc, and at the same n time locating the spring where it provides a direct action on the said feed disc arm. The needle bar yoke has formerly been mounted on a single rod and as it is moved backward and forward by an eccentric, it moves from side to side and the wearing parts receive comparatively hard service, so that another bar has been added, providing a two-point support and an independent mounting, reducing the wearing to a minimum. And whereas the ain shaft operates suc-= cessfully at low speed, it has been found necessary to re-design the mounting, placing ball bear-1 ings in both sides of the frame, and also at the belt wheel at the outer end of the shaft.

The object of the invention is, therefore, to provide improvements in machines for sewing fur and the like by increasing the wearing surfaces of the parts thereof to compensate for increased speed of the machines.

Another object is to provide means for increas-' ing the wearing surfaces of fur sewing machines without increasing the size of the main frame.

- A further object is to provide lubricating means for a' fur sewing machine, which may be installed in the frame of machines without increasing-the size thereof, and in which all of the operating parts may be contained within the main frame.

A still further object is to provide means for increasing the wearing surface of the looper bar mounting without changing the size of the frame in which it is mounted.

And a still further object is to proviide means for improving fur sewing machines by increasing the wearing parts to compensate for increased speed, all of which are comparatively simple and inexpensive.

with these ends in view the invention embodies a fur sewing machine in which the wearing surfaces of the cams, eccentrics, and substantially all of the moving parts have been increased without increasing the size of the main frame in order to compensate for increased speed.

Other features and advantages of the invention will appear from the following description,

taken in connection with the drawings, where- Figure 1 is a view showing a side elevation of the machine with part broken away showing the lubricating pump.

Figure 2 is a view looking toward the opposite side of the machine with part broken away,

and parts omitted.

Figure 6 is a detail showing a front view of the clutch.

Figure 7 is a detail showing the improved mounting of the needle bar yoke.

Figure 8 is a similar view showing an alternate type of mounting for the needle bar yoke.

In the drawings the device is shown as it may be made, wherein numeral I indicates the main frame, numeral 2 the main shaft, numeral 3 the looper frame, numeral 4 the needle bar yoke, numeral 5 the clutch, and numeral 6 the lubricating pump.

The main frame is substantially the same as has been used heretofore, and this consists of four substantially straight walls 8, 9, ID, with an extending *part II at the front, in which the clutch and brake are mounted, and this part is covered by a cap l2, and the main frame by a cover I 3. It will be understood, however, that the frame may be of any type or design, and may be arranged in any manner.

In the design shown in Figure 4 the frame is provided with a boss I 4 in the side 9, and an extended boss |5 in the side 8, and the main shaft 2 is rotatably mounted in the bosses I4 and I5 by ball bearings l6, l1, and I8. The bearing I6 is covered by a cap I9, and the bearing I8 by a cap 20. It will be noted that the bearing I6 is held against a shoulder 2| on the shaft 2 by a nut 22, and the bearings l1 and I8 are held against a. shoulder 24 by a nut 25 and sleeves 26 and 21. In this design the belt wheel 28 is mounted upon the sleeve 21, however, it will be understood that this may be mounted directly upon the shaft or in any manner. It will also be understood that the shaft may be mounted in bearings of any other type or the arrangement of the ball bearings may be changed, as may be desired.

The looper frame 3, which is shown in detail in Figure 3, is formed with downwardly extending members 29 and. 36, and the looper frame eccentric 3|, which is mounted on the shaft 2, is

mounted between the members 29 and 38 through a sliding block 32 having flanges 33 and 34 at the sides which engage the sides of the members 29 and 30, and the lower ends of the members 29 and areconnected by a bolt 35 by which slight wear between the block and members 29 and 38 may be taken up. The looper 36 is mounted in the looper chuck shell 31 on the outer end 1 38 of the shaft 39, and the outer end of the shaft is provided with a shoulder 40 adapted to engage the end 4| of the frame 3 to take the inward thrust of the looper, and this surface has been increased to compensate for the wear thereof. The shaft 39 extends into the frame, and the looper oscillating arm 42 is secured to the shaft, and it will be noted that the forward end of the arm 42 is provided with a boss 43 which engages the end 44 of the forward part of the frame 3, providing a relatively large bearing surface to increase the wear therebetween. A pin 45 extends outward from the arm 42 as shown in Figure 4, and this extends into a ball 46 in a cam groove 4'! in an oscillating cam 48, audit will be noted that as the cam rotates it will twist the shaft 39 through the arm 42. The upper rear corner of the frame 3 is formed with a fork having upper and lower sides 49 and 50 and a sliding block 5| is mounted between the sides 49 and 50 of this fork on a bolt or pin 52, the bolt 52 being mounted between the ears 53 and 54 extending upward from the back 8 of the main frame I. The lower forward corner of the frame 3 is provided with a hub 55 through which it is mounted on a pin 56 of the looper frame rocker 51, and the rocker is formed on the end of a shaft 58, which is rotatably mounted in a looper rocker bracket 59, which is held on the front I of the machine by bolts 60 and 6|. The hub 55 of the frame 3, and also the hub of the bracket 59 have been materially lengthened to compensate for wear, thereby providing substantial bearing surfaces in these parts. It will be noted that as the shaft rotates the eccentric 3| will move the looper frame backward and forward, and with. the opposite corners held between the pin 52 and the rocker 51, this frame will have an oscillating movement, and at the same time the cam'48 will turn the looper, through the groove 4'! and ball 46.

The needle yoke 4 is formed as shown in Figure '7, with a back plate 62 having ends 63 and 64, and hubs 65 and 66, with their forward surfaces formed with slots 61 and 68. The upper and lower parts are held by bolts 69, 10, 1|, and 12, so that any slight wear therein may readily be taken up by screwing the bolts or screws inward. The upper hub is fixedly attached to the needle bar 13 on the outer end of which the needle is .mounted, and the lower hub 66 is slidable on a stationary shaft 14. The forward end of the bar 13 is slidably mounted in' a special bearing 15 which is adapted to eliminate wear between the bar and frame. The yoke 4, formerly mounted on a single upper shaft similar to the shaft 13, is moved backward and forward by the needle bar yoke eccentric 16 mounted on a shaft 2, and this causes a twisting movement and side play wearing the sides thereof, whereas, with the lower end slidable on the shaft 74, side play is eliminated and an independent mounting provided.

This device may also be made as shown in.

Figure 8, in which a sliding block 11 is provided between the eccentric, which is indicated by the numeral 18, and the yoke 4, and it will be noted that this provides a continuous bearing on the outer surface of the eccentric and a sliding contact between recesses 19 and 80 in the edges of this block, and the, inner surfaces of the members 63 and 64. The feed disc arm 8| is mounted on two shafts 82 and 83 through a base 84, and these shafts are slidably held in the frame, and the arm is resiliently held inward by a spring 85, one end of which is held on a bolt 86 extendend is held on a bolt 81 on which is a thumb nut 98, by which the bolt may be moved inward or outward to adjust the tension on the spring. The lower shaft 93 is formed with a flat space 99 and ayoke 99 of the pressure lever 9I extends upward through the space 89 and is adapted to move the arm 8I forward as a lever 92 on the opposite end of the member 9| is drawn downward. In Figure 1 a chain 93 is shown attached to the outer end of the lever 92, and this chain may be connected to a foot lever or any-suitable means by which it may be drawn downward. The pressure lever 9| is pivotally mounted on a shaft 94 which extends through the frame, as shown.

The clutch 5 is preferably made as shown in Figure 2, and this is operated by an eccentric 95 on the shaft 2, which operates in a hub 96 of an arm 91, andthe lower end of the arm is connected by a pin 98 to a lever 99 which is pivotally mounted on a pin I99 through a slot I9I, and

the pin is slidably mounted in a slot I92 in the main frame I.

The opposite end of the lever 99 is connected by-a pin I93 to the clutch operating bar I94, and it will be noted that as the eccentric 95 moves the arm91 upward and downward, this will raise and lower the end of the lever 99, and this will, in turn, raise and lower the opposite end of the lever and operate the clutch. The movement of the clutch may be adjusted by moving the pin I99 back and forth in the slot I92, and it will be noted that the pin is adjustably held by a lock nut I95 on the outer end, and the inner end is held in the lever 99 by a nut I96. A block I91 is provided on the pin I99, and this is formed with a section I99 having fiat sides which engage the surfaces at the sides of the,

slot I99 of the lever 99, and it will be noted that with this block pivoted on the pin I99, it will be free to twistwith the movement of the lever 99, thereby permitting free movement thereof, and at the same time permitting adjustment in the movement. The pin I99 may also be provided with a pointer I99 to indicate the position or movement from the exterior of the main frame.

The clutch'bar I94 is formed with .a yoke I99 at the inner end, and this is provided with a bolt 9, at the open ends, and with a sliding block III on the shaft II2, upon which the bar is mounted. The bolt I I9 may be tightened to t e up slight wear in this connection. The bar I 4 is positioned against the side of a toothed wheel II3 which has a circular hub H4 at the back, and the bar I94 is provided with two rollers II 5 and H6 which engage the inner surface N1 of the hub H4, and the outer portion of the bar is formed with a'slot I18 having an inclined outer surface II9 which slopes downward in the position shown in Figure 2, and a roller I29 is mounted between the outer surface I2I of the part H4 and the surface H9, and it will be noted that as the clutch bar is moved upward the roller will-jam between these two surfaces and thereby form a positive lock, causing the wheel II3 to move upward therewith, and with the teeth of the wheel H3 meshing with the teeth of a gear I22, the gear I22 will rotate with each upward movement of the clutch bar I94. The roller I29 is resiliently held downward by a spring I23 engaging the roller through a pin I24, and the spring is held in a recess in a member I25 on the upper side of the bar I94. This is a typical arrangement of the clutch, however, it will also be understood that the clutch may be provided with two rollers, similar to the brake shown in Figure 3, and it will also be understood that the brake may be formed with only one roller, similar to the clutch shown in Figure 2, as either design may be used for either the clutch or brake.

It is necessary to hold the shaft II2 so that it cannot move backward, and so that it will only cooperates with a wheel I3I having a cylindrical hub I32with rollers I33 and I34 engaging the inner surface, and with rollers I35 and -I36 engaging the outer surfaces, andan inclined surface I31 of the bar I26. A light spring I38 is provided between the rollers I35 arid I36, and a slightly'heavier spring I39 which is held in a cap I49 on the bar I23 engages the larger roller, and

it will be noted that these springs hold the rollers in engagement with the respective surfaces,thereone roller instead of two, and also that the clutch may be provided with two rollers, if. desired.

The oil pump 6 is formed with a cylinder MI and a plunger I42, with the upper end of the plunger held in a bearing I43, and withthe part supported on the inside of the main frame in a bracket I44, and held by bolts I45 and I49. The

plunger I42 is operated by an eccentric I41 through an arm I49, the lower end of which is pivotally attached to the plunger I42 through ,a collar I49 fixedly mounted on the plunger, and

provided with a pin I59, which is pivotally held in a hub at the lower end of the arm. It will be noted that as the eccentric moves the arm upward and downward it will move the plunger upward and downward, and as the plunger moves upward it will draw liquid into the cylinder through' a check valve I5I at the lower end, and as it moves downward it will close the check valve I5I and unseat the check valve I52, thereby forcing the liquid through a, tube I59 to a pan I54, in the upper part of the machine. The machine is provided with a drip pan I55 at the lower ward into the drip pan, and this is provided with openings I51 through which oilmay be drawn into the cylinder so thatall oil dripping downward in the machine will be adapted to be drawn upward, and pumped back to the pan at the upper end. The tube I56 may be provided with filtering material I59 for straining or cleaning the oil,

-however,.it will be understood that any means may be provided for cleaning the oil. The pan I54 may be supported in brackets I59 and I69 in the upper part of the machine, and this may also be provided with an overflow tube I ll which will take oil back to the pan I55, however, it will be understood that the pan I54 may be provided with openings I62 which may be located at different points, so that oil will drip from the pan upon the different operating parts of the machine, and these openings may be located at any end, and a pump supply tube I56 extends downpoints desired. It will be understood that a pump of any other type or description may be used, or

any means may be provided for automatically elevating the oil and feeding it back upon all of the moving parts of the machine.

It will be understood that other changes may general design or arrangement-of any of the parts, another may be in the use of a clutch or brake of any other type or design, and still another may be in the use of bearings, cams, eccentrics, or other operating parts, in combination with the parts shown and described, in order to complete the operation of this machine or improve the same.

The construction will be readily understood from the foregoing description. In use the machine may be provided as shown and described, and it will be understood that this application only covers the improvements in the parts and, therefore, does not describe many parts of the machine, such as the front feed discs, needle bar,

looper, and thread feeding mechanism. With the machine constructed as shown and described, it will be operated by a belt or the like over the belt wheel 28, and with thread placed through the needle I63 and threaded through the remaining parts of the machine, material may be fed through the feed discs and sewed at comparatively high speed.

As the machine operates, the main shaft 2 rotates, and the eccentrics and cams move the the same time the looper is turned by the shaft upon which it is mounted, which is connected through the member 2 to the ball 46 in the cam groove 41. During this movement, the cam 16 moves the needle bar yoke backward and forward, and whereas the needle bar yoke was formerly mounted only on the bar or shaft 13, it is now provided with bearings at the lower end, with the lower end sliding on a stationary shaft 14. With- .out the'shaft 14 the yoke would have a twisting movement about the shaft M, causing wear in the bearings in the frame and, therefore, with the lower end slidably held, this twist is entirely eliminated, and the yoke has a positive backward and forward movement. It is thought that this will be sufficient to compensate for the high speed of the machine, however, it may also be provided with a sliding block 11, as shown in Figure 8, which will further diminish wear between the eccentric and the surfaces of the yoke.

The looper frame normally develops considerable wear'at high speed at the upper end of the frame, as the thrust of the looper in both directions causes considerable wear against the frame parts, and this causes play, which is objectionable, so that all engaging parts of the looper shaft have been increased and provided with bolt upon which it slides and, therefore, the block 5| has been inserted between these-parts, which increases the bearing surfaces, and diminishes the wear. Heretofore the cam 3| has operated against the flat surfaces of the parts 29 and 30, and with this oscillating movement the cam, engaging at two points only, wears these surfaces considerably', so that considerable play develops and, therefore, the block 32 has been inserted, which provides continuous engagement with the cam or eccentric surface, and an easy sliding movement between the block and fork of the looper frame. The lower ends of the fork are also provided with a bolt 35, by which any wear that may develop may be taken up. It has also been found that the lower forward corner of the looper frame wears considerably on the pin of the rocker 51 and, therefore, the boss 56 has been provided on the side of the frame to lengthen the bearing and reduce this wear to a minimum. The length of the bearing 59 has also been increased to provide more bearing surface and reduce the wear between these parts.

'The spring has normally been positioned in the lower part of the frame, and this has made it necessary to use a relatively, short arm in place of the arm 92, and operators have found it objectionable because the short arm requires considerable strength on the downward pull of the chain 93, whereas by arranging the spring between the bars 82 and 83 it is possible to double the length of the lever 92, and thereby reduce the force necessary ,to operate the lever to move the feed disc arm 8| outward. The shaft has also normally been mounted directly inbearings in the frame, and although these were satisfactory for the speed at which the machine was designed to operate, these bearings develop considerable play at the high speed which is now required of the machine and, therefore, it has been found necessary to provide space in the frame for ball bearings, so that the main shaft may be mounted in ball bearings, as shown. With these improvements in the operating parts of this machine, it is possible tooperate the machine at about twice the normal speed without increasing the size or external appear ance, and by using substantially all of the original parts thereof. i

Having thus fully described the invention, what I claim as new, and desire to secure by Letters Patent, is:

1. In a sewing machine for fur, and the like, of the type having feed discs for holding the material, a needle bar operated by 5- needle bar yoke, a looper operated by a loorer frame, a

feed disc arm resiliently holding one of the feed sides slidably engaging the sides ofthe fork of said frame. 4

2. The combination with a machine as described in claim 1 of a. main frame forming a housing in which the parts are mounted, said housing characterized by extensions at the sides,

providing mounting for ball hearings in which the main shaft is rotatably mounted.

3. A machine as described in claim 1, in which the forward lower corner of the said looper frame is pivotally mounted on e looper frame rocker through a bearing, and characterized in that an extension is provided at the side of said looper frame increasing the length of said bearing.

4. A machine as described in claim 1, in-which the forward lower cornerof the said looper frame is pivotally mounted on a looper frame rocker through a bearing, and characterized in that an extension is provided at the side of said looper frame'increasing the length of said bearing, and also in which the said looper frame rocker is pivotally mounted through a bearing, and further characterized in that the bearing is extended, providin greater bearing length therein.

5. A machine as described in claim 1, characterized in that the feed disc arm is resiliently held inward by a spring positioned in alignment therewith.

6. A machine as described in claim 1, in which the feed disc arm is slidably mounted on two rods and resiliently held inward by a spring between the two rods.

7. A machine as described in claim 1, in which the feed disc arm is slidably mounted on two rods and resiliently held inward by a spring between the two rods, and characterized in that the said feed disc arm is moved outward by a bell crank positioned on a shaft adjacent the back of the machine with a comparatively long lever arm extending forward from said bell crank and through which the bell crank is operated.

8. A machine as described in claim 1, characterized in that one of the feed discs is rotated by an intermittent motion and said rotating means is operated by an eccentric through a clutch and characterized in that the clutch is formed with a roller between'a wheel rim and an inclined surface, providing a wedge action.

9. A machine as described in claim 1, characterized in that one of the feed discs is rotated by an: intermittent motion and said rotating means, isloperated by an eccentric through a clutch and characterized in that the clutch is formed with a roller between a wheel rim and an inclined surface, providing a wedge action, and further characterized in that the said intermittent drive is restrained from backward movement by a brake formed with a roller positioned between a rim wheel and an inclined surface,-

also providing a wedge action.

10. A machine as described in claim 1 in which the said looper is mounted on a shaft in the said looper frame, and characterized in that friction collars are provided between the moving parts of said looper mounting mechanism and the looper frame.

11. The combination with a machine of the class described, of a clutch operating a part of said machine with an intermittent motion, charthereon, in which the said toothed wheel is provided with a cylindrical hub cooperating with said bar, rollers pivotally mounted on said bar engaging the inner surface of said hub, said bar adapted to be raised intermittently from the outer end thereof, said bar havingan inclined surface positioned outside of the periphery of the hub on said toothed wheel, a roller positioned between said inclined surface and the periphery of said wheel, and means resiliently holding said roller in engagement with said surface and wheel.

12. The combination with a machine of the class described, of a clutch operating a part of said machine with an intermittent motion, characterized in that the clutch is formed with a bar pivotally mounted on ya shaft having a toothed wheel thereon, in which the said toothed wheel is provided with a cylindrical hub cooperating with said bar, rollers pivotally mounted on said bar engaging the inner surface of said hub, said bar adapted to be raised intermittently from the outer end thereof, said bar having an inclined surface positioned outside of the periphery of the hub of said toothed wheel, a roller positioned' between said inclined surface and the periphery of said wheel, means resiliently holding said roller in engagement with said surface and wheel, a

second larger roller also positioned between said inclined surface and the periphery of said wheel, and means resiliently holding said second roller in engagement with said inclined surface and wheel.

13. In a sewing machine for fur, and the like, of the type having feed discs for holding the material, a needle bar operated'by a needle bar yoke, a looper operated by a looper frame, a feed disc. arm resiliently holding one of the feed discs, and a main driving shaft with suitable eccentrics and cams for operating the respective parts, and in which the needle bar yoke is formed with flat surfaces at each end; the combination of a sliding block slidably engaging said flat surfaces and rotatably mounted on an eccentric operating said needle bar yoke. I

14. In a sewing machine for fur, and the like, of the type having feed discs for holding the material, a needle bar operated by a needle bar yoke, a looper operated by a loopenframe, a feed disc arm resiliently holding one -of the feed discs, and a main driving shaft with suitable eccentrics and cams for operating the respective parts, and in which .said needle bar yoke slidably operates backward and forward and is mounted upon a shaft at the upper end, the combination of a second shaft slidably mounting the lower end thereof.

THOMAS C. MLADINICH. 

